Benjamin f



B. F. MERRITT.

SPEED CONTROL GOVERNOR.

APPLICATION fut-ED OCI-1.19?. 1 ,306,072. Patentedune 10, 1919.

by Avy,

.-xnotor.

A further feature of this inventionis thel provision of ineens for.changing the ed- UNITED STATES PATENT OFFICE.

BENJAMIN F. M-ERRITT, 0F EAST ORANGE, NEW JERSEY, ASSIGNOR TO WESTERN'ELECTRIC GOMPANY, INCORPORATED, =0F NEW YORK, Nl Y., A CORPOBATTON orNEW You.. y

SPEED-CONTROL GOVERNOR.

Patented J une iii, 1919.

Application filed October 1, 1917. lSerial No. 194,146.

To all whom. it may consom:

Be it known that I, BENJAMIN F. MER- srrr, e citizen of the UnitedStates, residing et East Orange, in the county of Essex and Sta-te ofNew Jersey, have, invented certain new and useful improvements in Speed-Control Governors, of Wh'icn. the following is e fullj clear, concise,und exact description.

This invention relates to speed control governors and more particularlyto centrifngel governors for automatically controlling the speed ofelectroresponsive driving motors or mechanisms.

. The principal object'oi this invention is to provide t governor ofsimple, eificient and compact form for automatically regulating thespeed of a driving ineens in order to maintain e subst-entiellyvconstant speed of the moving parts thereof.

A feature of this invern/ionV is the provision of adgusteble Ineens forrenderingV the governor eiective to control and maintain differentpredetermined speeds of e' iustment oi the governor While the motor isin operation.

This invention' is illustrated in tht ecompenyingdrswing, in whichFigure 1 is a. top View of the governor operatively ineluded with enelectric motor, a. portion of an Vouter casing of the governor 'beingomitted in order to clearly show the various ports' assembled therein;Fig. Z is en end Viet-vof the governor, tin end plate portion of theeasing being omitted in order to show various parts therein; Fig. 3 is aside view of the governor portions thereof being shown in perspectivewhile other portions are shown in section; Fig. 4 is en enlarged vtopsectional view of en varrangement for varying adjustments to control the'speed range limits of the governor-Fig 5 is aj side sectional view of e'collector ring asscmbly employed in esteblishingcircuit connectionswith the governor; this assembly.

also serves as a nave or supporting hubyfor ortons of the governorequipment; `and `g. 6 shows circuit arrangement of the equipment.

In describing this invention like ol'uufmc-l tersof reference willbeemployed in so fa r 1 as they apply to designate corresponding' parts inthe various views of the drawing.

The reference character 10 .indicates e. base portion only of the motorbeing shown) the shaft thereof being positioned on the line 3.--3` Anoutstanding end 12 of the motor shaft extends into en exielly olinedbore through e hub-like assembly 13 which is held-to the shaft 12 bymeans effe set screvv 14 (Fig. 3). The assembly 13 'is formed of aninner metal sleeve i5 over which is fitted u sleeve' 16 of insulsting,ume.- terial forming n core to c zirrytvvo collector rings 17 end 18 helds eced by two ennulerly formed sections oiinsulnting nieterial 19 and20. A

A disk-like assembly plete 30 preferably formed frominsulating materielto the nmembly 13 by, .means of s screvv 2 3 threaded into the collectorring i7 und e screw 24 threaded into the collectorl ring 18. The screws23 end 24 respectively pees through angle brackets 81 sind 32 and s i isclamped secure these brackets to the outer fece of the plate 30, screws25: (Fig. 2) being employed to steady positions.

A 'Eexible metal member 33 (Fig. 2)

riveted to s metallic member 34 is attached y journal 42 in which s.shaft 43 is revclubly carried. A disk-wheel 4i clamped by ineens ofscrews 45 to a. flange of the shaft 43, is positioned so that e ortionci' its periphery projects through si slotted opening 8 inthe supportingplate 30.- Aboreexfbnding exielly through the shaft 43 is threaded toretothe screw 46 near its end extends through the slotted opening in'the plate 41. It will therefore be clear that on revolving the thebrackets in their respective celve a, screw 46, anda' key pin 47u.ttached shaft 43 by t.urning the -disk-Wheel 44 the screw v46. whileheld by the pin 4T and the plate-41 againstrotatiomwill be fed eitherforwardor backward by the threaded bore, eccording .tothe direction'inwhich thesheft 4? ;is rotated, .Ahelical's ring '48 attached between aneye ,i'Ii `the end) of s the screvv 46 and an eye liiia rivet 49-vvhichextends through the Contact -member 34 at an indented pointtherein, exerts pressure to retain the contact points 36 and 37 inengagement one with the other.

To the base plate 10 a lerer 53 is pivoted by means oi a bearing screjw54, and from the forward end of the lever a helical spring 57 extendsand is anchored to the base plate l() by means ot' a screw 28 therebyretaining the lever 53 alined as shown in the drawing.

The periphery of the supporting disk 30 is turned to proiide a recess 50 to receive and'form a rabbeted joint with the rim of a circular formedcup-lilre casing 58 secured by means of screws 59'whieh pass through thecasing and engage threaded bores 60 in the mounting plate 30. A slottedopening 9 in the bottom or end plate portion ofthe casing 58 permits aportion of the revolu ,ble disk wheel te .to extend in clearancealinement therethrough in a manner similar to the position of anopposite portion of the wheel 44 through the opening Sin the plate 30 asalready described.

An angle bracket 51 secured to the base 10 by means of screws serves asa holder to carry brushes 21 and 22 which are thereby retained incontact with the collector rings 17 and18 respectively. c

In tracing the circuit paths of this system,

a conductor 27 (Fig. (i) extends from a a liist shunt thereon is formedthrough a' resistance unit 2Q of relatively high value,

while a second shunt is formed through a condenser 38 and a resistanceunit 3:) in series therewith, the action of which well understood in theart.

From the foregoing description it will be clear that the governorassembly as carried by the shaft 12 revolves with the motor armature.and that centrifugal force thereby set up has a tendency to move thefree end of the member 34 outwardly to separate the contacts 36 and 37.l'n order to adjust the member to require .the application oi' a fycertain amount or centrifugal force, which corresponds with apredetermined speed of the motor armature, before the contacts 36 and 37separate, the disk-wheel lllV may be turned in either direction tosuitably tension the control spring 48,

ln providing,q that adjustments of the control springir 4S may takeplace while the motor armature is revolving, as in its regular 1 drivingwork, two flanges 61 and 62 formed upwardly. on the lever 53 stand onopposite sides of the governor casing 7 in alinement with paths throughwhich the oppositely exe posed edges or" the adjusting disk-wheel 44sweep as the governor 7 is revolved by the armature of the motor. Toaccomplish such ladjustments the extending handle or tle lever 53 may bemoved toward its stop screw 55, thereby bringing the lange 61 into thepath of the disk-wheel rlhe periphery of the wheel and the surface ofthefiange are of suitable friction material or Aii'oughed to establishbite therebetween in order 62. Since the screw 46 is shown with aright-hand thread and assuming the motor plain metal surfaces on theflanges 61 and to be running' in clock-wise direction, looking at thegovernor equipped end of the armature, the assumed position o1" thelever 53 will cause the disk-wheel 4A: to revolve the shaft 43 to nievethe screw 46 forward,

thereby reducing the tension on the control spring e8. it will beobvious that conversely with such operation, movement of the leverhandle 53 toward its stop screw 56 -will cause the flange 62 to engageand move the diskwheel 4.4 in the opposite direction, thereby backingthe screw f 6 and increasing the tension on ,the control spring- 48. Inthis way the tensionvo'f the control spring 48 may be readily increasedor decreased while the Ino tor 11 is running and the speed range limitsof the motor accordingly varied or changed.

When'the spring 48 is adjusted to permit the motor to attain a certainpredetermined speed, any increase in speed will develop sufficientcentrifugal force on the member .3st to effect separation of thecontacts 36 and A37, thereby disconnecting the source oi' current supply26, until the' speed of the motor is reduced suiliciently to permit thediminished centrifugal force render the tension of the spring' 48suicieht to move the memher 345 torestablish the czontacts 36 and 37.

To illustrate a preferred arrangement as to operating proportions, ithas been found desirable` to' employ a driving current having apotential suiiiciently high to operate the motor 11, it' non-governed,at a higher speed than would be required by the worn` the mot-Orisintended to perform. This permits the governor to be adjusted for anydesired lower speed, and the tendency of the motor to-eXCeed such speedimmediately causes the contacts 36 and 37 to operate` in alter.- natelydisconnecting' andcOnneCtingthe curren'rsupply, therebyniaintaininfrgthc speed i which thc governor vmay have been previouslyadjusted.

Itavill be obvious that the present governor may be readily applied toany form of motor drive and it mayy be mentioned that motors controlledin this manner are found to satisfactorily meet the requirements fordriving distributers in telegraphsystems or for any driving operationnecessaryin printing telegraphs.

lVhat is claimed is:

1. In a speed governor, a motor, a rotatable shaft controlled thereby, amovable member adapted to travel'with said shaftv and to be influencedby centrifugal force, spring means for opposing the effect ofcentrifugal vforce on said movable member, adjustable means for varyingthe tension of said spring means, contacts controlled by said movablemember, means for routing thel operating circuit of said motor throughsaid contacts,

, vmanually operated lever means having opposite limits of movementpositioned stationary with respect to said shaft, flanges carriedlby-said lever for operatively engaging saidadjustable means, and springmeans Ito normally retain said lever at a point inter mediate its limitsof movement.

2. In a speed overnor, a rotatable shaft, a motor means or operatingsaid' shaft, a hubbed disk fixed to said shaft and axially alinedtherewith', a member supported by said disk, positioned on the facethereof, Ameans to render said member responsive to l centrifugal force,contacts controlled by said member. spring means and adjustable meanstherefor for varying the contact pressure effect of said member, meansfor routing the driving circuit of said motor through said contacts,manually operated lever means positioned stationary with respect to saidshaft, and flanges carried by said lever means for operatively engagingsaid adjustable means.

3. In'a speed governor, a rotatable shaft, motor means for operatingsaid shaft, "adisk fixed to said shaft in axial alinement therewith, acircuit control assemblycarried on the face of said 4disk comprising amember responsive to centrifugal force, contacts controlled by saidmember, spring means for normally retaining said member to close saidcontacts, screw means for varying the tension of said spring means,circular means for operating said screw means, means for routing thecircuit of said motor through said contacts, a cup-like cover fixedtosaid disk to forman inclosing casing for the face thereof, aperturesrespectively in said disk and said cover to permit opposite portions ofthe periphery of said circular means to extend therethrough,respectively, lever means positioned stationary with respect to saidshaft, and flanges carried by-said lever mea-ns to operatively engagethe periphery of said circular means.

4. The combination with an electric motor having a rotatable shaft, aspeed governor comprising a hub-like assembly provided with a first anda second collector ring fixed to said shaft, brushes for said collectorrings positioned stationary with respect to said shaft, a disk fixed tosaid lmb assembly, axially alined with said shaft and rariving anassembly comprising a first and av second bracket fixed to the face ofsaid disk and electrically common respectively to said rst and Secondcollector rings, a contact carried by said first bracket, a contactmember engaging said contact and flexibly supported by said secondbracket, a spring for normally joining said contact member with saidfirst mentioned contact, a circuit routed through said brushes andcollector rings and said contacts for operating said motor, screw meansfor varying the tension of said spring means, a friction wheel carriedby said screw means and positioned axially to form a right angle withrespect to said shaft, means to permit'oppositely positioned portions ofthe periphery of said friction wheel to extend beyond the' assemblyonthe face of said disk and also beyond the rear surface of said disk, amanually operated lever positioned stationary with respect to said shaftand adapted to be moved either to a right-hand or aleft-hand position,spring means for normally retaining said lever at a point intermediateits right-hand and left-hand positions, 'and oppositely positionedflanges carried by said lever and respectively adapted to operativelyengage either the periphery of said friction'wheel as present beyond theface of said disk or the periphery of the friction wheel which mayextend beyond the rear surface of said disk.

In witness whereof, I hereunto subscribe my name this 22nd day ofSeptember, A. D. 1917.V

BENJAMIN MERRITT.

